Since start of August my household has had 4 tests...
Test 1, hospital on admission with appendicitis but slightly raised temperature so had to be treated as suspect until negative test. Unavoidable unless hospital wanted to gamble!
Test 2, 3 days after school starts toddler has 40 degrees temp, clearly we go and test... required 2 visits to A&E as not Calpol responsive plus caused weird balance issues (probably ear infection!)
Tests 3 and 4. School aged child has cough and temperature, DH has cough. Both get tested. Fortunately toddler managed to avoid developing a temperature.
3 and 4 were unnecessary in hindsight, but DH works with the public in a role where social distancing is not really possible. We also have positive cases in the neighbouring school in the same aged class, so again better to be careful given we had a temperature in a child that doesn't often get them.
Haven't tested snotty toddler who clearly has a cold that has barely affected his sister because he's not coughing, just dripping snot and drooling, and doesn't have a temperature (and usually spikes one with very limited provocation), plus he's not in childcare...